自定义导航栏搜索框透明问题

真机环境测试过 iPhone 5S 、 iPhone6、小米8、华为、OPPO

[内容]
使用plus.nativeObj.View原始画导航搜索框

1、默认时为头部渐变、自己画一个0.2透明度的搜索框（这里存在问题）
2、当向上滚动一定位置，隐藏默认并显示绘制在导航条上的搜索框（这里无问题）

重现步骤
[步骤]
因做在首页，打开即可看到
[结果]
苹果真机无问题，能够有透明，安卓手机（测试了小米8、华为、OPPO）没有透明，打开为灰白色的背景颜色
[期望]
苹果、安卓都一致用有透明的效果（因为用的全面屏顶部轮播图）

联系方式：15682019629
QQ：324834500

                const res = uni.getSystemInfoSync();  
                let defaultView = new plus.nativeObj.View('home-default', {top: res.statusBarHeight + 'px',left:'0px',height:'44px',width:'100%'},[  
                    {  
                        "tag": "rect","id": "rect","color": "#999",  
                        "position": {"left": "10px","right": "10px","top": "7px","bottom": "7px"},  
                        "rectStyles": {"color": "rgba(0,0,0,0.2)","borderColor": "#999"}  
                    },  
                    {  
                        "tag": "font","id": "font","text": "\ue466",  
                        "position": {"left": "15px","width": "30px","top": "7px","bottom": "7px"},  
                        "textStyles": {"size": "20px","fontSrc": "/static/uni.ttf","color": "#FFFFFF"}  
                    },  
                    {  
                        "tag": "font","id": "input","text": "搜索路况、目的地、游记、攻略",  
                        "position": {"left": "40px","right": "10px","width": "200px","height": "30px","top": "7px","bottom": "7px"  
                        },  
                        "textStyles": {"size": "13px","color": "#FFFFFF"}  
                    }  
                ]);  

                defaultView.addEventListener('click', onClick, false);  

                function onClick(){  
                    defaultView.hide();  
                    uni.navigateTo({  
                        url: '/pages/search/search'  
                    });  
                }  

                defaultView.show();

安卓问题截图：